javascript中的事件处理
事件处理:http://www.cnblogs.com/polk6/archive/2016/02/19/5154470.html#Menu2-DOMEventSpecification
addEventListener:http://www.cnblogs.com/lidabo/archive/2012/04/01/2429128.html
w3C school DOM Event对象:http://www.jb51.net/w3school/jsref/dom_obj_event.htm
textInput事件:http://www.cnblogs.com/snandy/archive/2011/04/02/2003035.html